28743

Appears in sequences

• Central factorial numbers: column 2 in triangle A008956.at n=5A001823
• Triangle of central factorial numbers |4^k t(2n+1,2n+1-2k)| read by rows (n>=0, k=0..n).at n=23A008956
• Sums of distinct powers of 13.at n=22A033049
• Expansion of 1/((1-x)*(1-x^2))^4.at n=16A038164
• Base-8 palindromes that start with 7.at n=19A043027
• Expansion of (1+6*x+x^2)/(1-x)^8.at n=8A059600
• Sums of terms of groups in A075626.at n=38A075629
• Triangle T(n,k) defined by the generating function cosh(sqrt(y)*arcsin(x)) + sqrt(y)*sinh(sqrt(y)*arcsin(x)) - 1 = Sum_{n>=1} Sum_{k=1..n} T(n,k)*y^k *x^n/n!.at n=46A091885
• Number of compositions of n where the largest part is less than the number of parts.at n=15A098125
• Indices among the primes of the primes in A020461.at n=8A138126
• Indices among the primes of the primes in A054356, The Five Hysterical Girls Theorem.at n=3A138132
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 1), (0, 1, 0), (1, 0, 1), (1, 1, -1)}.at n=8A150257
• Table of the number of (n,k)-Riordan complexes, read by rows.at n=25A160563
• Second column of triangle in A182971.at n=10A181888
• Triangle read by rows: coefficients in expansion of Q(n) = (x-n^2)*(x-(n-2)^2)*(x-(n-4)^2)*...*(x-(1 or 2)^2), highest powers first.at n=43A182971
• Number of 0..n arrays x(0..5) of 6 elements with each no smaller than the sum of its three previous neighbors modulo (n+1).at n=7A200670
• Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of even length (n>=0, k>=0).at n=45A202848
• Number of (n+2) X 4 0..1 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly one way, and new values 0..1 introduced in row major order.at n=6A204486
• Number of (n+2)X9 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly one way, and new values 0..1 introduced in row major order.at n=1A204491
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly one way, and new values 0..1 introduced in row major order.at n=29A204492